Finding the Fourth Proportional to 2,399.76, 3,311.55 and 1,351.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.76 : 3,311.55 = 1,351.89 : x
2. Step 2: Convert to fraction form
   2,399.76/3,311.55 = 1,351.89/x
3. Step 3: Cross multiply
   2,399.76x = 3,311.55 × 1,351.89
4. Step 4: Simplify right side
   2,399.76x = 4,476,851.33
5. Step 5: Solve for x
   x = 4,476,851.33/2,399.76
6. Step 6: Final answer
   x = 1,865.54